Best spot to farm [Event] Jewels of Imperfect Power?

Hey everyone,

With the new event "Upgrade with Imperfect Power", does anyone know which grind spot drops [Event] Jewels of Imperfect Power the most per hour?

My gear is around 1150 total AP and 605 total DP, so I can handle most Elvia and mid-to-high-end zones.
Trying to figure out where it’s most efficient to farm them. Any info from your testing or experience would be super helpful. Thanks!